I have built this now to test it and the gain is about this: 11mV input to the 6AK5 gives about 500mV out.

Sch3mat1c

28th March 2005 11:22 PM

You should be able to get ample gain out of it. One 6CL6 stage I tested (which drew 20-30mA, plenty drive for anything) had a gain of 80. 6AU6 is listed for up to 400 or so gain, not much current though. 6AK5 can probably do 50-200 gain at 1-10mA, depending on what it looks like... I can do some graphing if you'd like.

Yes, it's in French, but the important parts are universally understood anyway. Pages two and three show lots of operating points and gives the gain and tension de sortie pour 5% de distortion harmonique totale for each... (output voltage at 5% THD)

Masami

29th March 2005 02:19 PM

Hi Tekko,

thank you for your reply and circuit.
what is the B+ you used in these circuits?

Hi Tim,

I want around 100 gain and 50Vrms output.
Any suggestion?

Tekko

29th March 2005 03:51 PM

The B+ is around 230-270v.

Sch3mat1c

29th March 2005 09:18 PM

Quote:

Originally posted by Masami I want around 100 gain and 50Vrms output.
Any suggestion?